Cooking in
British Columbia
Thai
Foi Thong and Thong Yib (Golden Egg Threads and Pinched Sweets)
Two preparations from the Portuguese-influenced Thai court dessert tradition: foi thong — golden egg yolk threads, formed by drizzling beaten yolk through a fine-nozzled funnel or cone in spiralling patterns into simmering sugar syrup; and thong yib — small, pinched egg-yolk sweets cooked in the same syrup and formed into a lotus petal shape by pinching with the fingertips. Both preparations belong to the category of court sweets (khanom thai) whose origins Thompson traces to Maria Guyomar de Pinha, a Japanese-Portuguese woman who became the consort of the Greek adventurer Constantine Phaulkon at the Siamese court of King Narai (1656–1688) and is credited by Thai culinary tradition with introducing the egg-yolk-and-sugar sweet preparations of Portuguese colonial confectionery to the Thai court kitchen.
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Cook
I
The Market List
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For the sugar syrup
500 g
white sugar
Your own market
500 ml
water
Your own market
3–4 leaves
pandanus leaves
bruised
Not yet stocked in British Columbia
For both preparations
10
egg yolks
strained through a fine sieve to remove all membrane; liquid must be perfectly smooth
Your own market
II
The Method
1
Combine the sugar and water in a wide, shallow pan, add the pandanus leaves, and bring to a steady simmer over medium heat, stirring only until the sugar dissolves. Use a wide, shallow pan so that the syrup depth is even across its surface, giving the threads a consistent cooking environment rather than hot and cool patches. The syrup is ready when it is clear and simmering evenly — not boiling vigorously.
2
Strain the egg yolks through a fine sieve, pressing gently to eliminate every trace of membrane, so that the resulting liquid flows in one unbroken stream and does not block the nozzle and shatter the threads. Work patiently here — any solid matter left in the yolk will betray you the moment you begin to drizzle. The liquid must be entirely smooth and pour like thin cream.
3
For the foi thong: fill a squeeze bottle fitted with a 1 mm nozzle — or a banana-leaf cone with a pin-hole — with the strained yolk, hold it above the simmering syrup, and drizzle in a thin, continuous stream, moving in a steady circular motion to produce the characteristic swirling thread pattern. This is where the dish lives or dies: the syrup must hold at a steady simmer throughout, because too hot and the threads shatter on contact with the surface, too cool and they remain raw at the centre and carry an uncooked-yolk taste. Keep one hand free to adjust the heat as you drizzle.
4
Allow the threads to cook in the syrup for 60–90 seconds, so the sugar has time to travel fully into the yolk and replace the rawness with that characteristic deep sweetness. They are done when they transition from bright orange-yellow to a deeper, even gold — the colour tells you the sugar has fully penetrated. Do not rush this stage by raising the heat.
5
Lift the threads from the syrup using chopsticks in one continuous, unbroken motion, so the swirling pattern formed during drizzling is preserved rather than tangled into a knot. Arrange in a portion or fold lightly into a small mound.
6
For the thong yib: using the same yolk mixture and the same simmering syrup, release small, even amounts of yolk from the cone directly into the syrup as discrete drops — not drizzled — so each piece sets as a compact, self-contained round rather than spreading into a thread. Cook until each drop is set firm and pulls cleanly from the base of the pan, which tells you the sugar has locked the shape.
7
Remove the set drops while still warm and work quickly, pinching each one between thumb and two fingers — three evenly spaced pinches around the base — to form the tri-lobed lotus petal shape, because the sweet must be warm enough to hold the impression of the fingers; once cool it will not take the shape and will simply spring back. Move through the batch steadily so no piece has time to firm up before it is pinched.
III
Quality Hierarchy
01
Reserve — Duck egg yolks, which carry a deeper colour and a richer fat content than hen eggs, strained with particular care; pandanus leaves sourced fresh rather than frozen, contributing a clean, grassy fragrance to the syrup.
02
Estate — Free-range hen egg yolks of good colour; fresh pandanus leaves. Syrup made with a refined cane sugar that dissolves to a perfectly clear solution.
03
Market — Standard hen egg yolks carefully sieved; dried or frozen pandanus leaf. The dish remains fully authentic at this rung when technique is sound.
04
House — Standard eggs, no pandanus. The sweets will be less fragrant but structurally correct if syrup temperature and drizzling motion are controlled.
IV
Sensory Tests
◇Sight. The sugar syrup is clear and moves in a steady, even simmer — no vigorous rolling boil, no still patches.
◇Sight. The egg threads deepen from bright orange-yellow to a settled gold, indicating the syrup has penetrated fully.
◇Touch. The thong yib drops pull cleanly and without sticking when lifted — they are set through, not soft at the centre.
◇Touch. The thong yib, when pinched while warm, holds the tri-lobed lotus impression without cracking or collapsing.
◇Where it lives or dies. The syrup must hold at a steady simmer throughout the drizzling and cooking of both preparations — too hot and the threads shatter; too cool and the yolk remains raw at the centre.
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VI
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